Erna Lassenius has experience within different areas of mental health and psychiatric care, having worked both as a psychiatric nurse and as a clinical supervisor. She has over the years held various clinical leadership positions. She has also been involved in teaching activities as well as having a co-leadership position in nursing curriculum development at both bachelor and advanced academic level. She has been employed at Vestfold University College since 2009. Her teaching activities are related to the diploma studies and Master Programme in mental health work.